Effective temperature of ionizing stars of extragalactic HII regions -- II: nebular parameter relations based on CALIFA data

Abstract

We calculate the effective temperature ($T_{\mathrm{eff}}$) of ionizing star(s), oxygen abundance of the gas phase $(O/H)$, and the ionization parameter $U$ for a sample of H\,{\sc ii} regions located in the disks of 59 spiral galaxies in the 0.005 < z < 0.03 redshift range. We use spectroscopic data taken from the CALIFA data release 3 (DR3) and theoretical (for $T_{\mathrm{eff}}$ and $U$) and empirical (for O/H) calibrations based on strong emission-lines. We consider spatial distribution and radial gradients of those parameters in each galactic disk for the objects in our sample. Most of the galaxies in our sample ($\sim 70$ \%) shows positive $T_{\mathrm{eff}}$ radial gradients even though some them exhibit negative or flat ones. The median value of the $T_{\mathrm{eff}}$ radial gradient is 0.762 kK/$R_{25}$. We find that radial gradients of both $\log U$ and $T_{\mathrm{eff}}$ depend on the oxygen abundance gradient, in the sense that the gradient of $\log U$ increases as $\log (O/H)$ gradient increases while there is an anti-correlation between the gradient of $T_{\mathrm{eff}}$ and the oxygen abundance gradient. Moreover, galaxies with flat oxygen abundance gradients tend to have flat $\log U$ and $T_{\mathrm{eff}}$ gradients as well. Although our results are in agreement with the idea of the existence of positive $T_{\mathrm{eff}}$ gradients along the disk of the majority of spiral galaxies, this seems not to be an universal property for these objects.

arXiv comment11 pages, 11 figures; accepted for publication in MNRAS

References in corpus (61)

• Stellar population synthesis at the resolution of 2003
• The Origin of the Mass--Metallicity Relation: Insights from 53,000 Star-Forming Galaxies in the SDSS
• Theoretical Modeling of Starburst Galaxies
• Metallicity Calibrations and the Mass-Metallicity Relation for Star-Forming Galaxies
• CALIFA, the Calar Alto Legacy Integral Field Area survey: I. Survey presentation
• A Cosmology Calculator for the World Wide Web
• A new calibration of stellar parameters of Galactic O stars
• A fundamental relation between mass, SFR and metallicity in local and high redshift galaxies
• The 'Forbidden' Abundance of Oxygen in the Sun
• A Universal Stellar Initial Mass Function? A Critical Look at Variations
• The Galactic O-Star Spectroscopic Survey. I. Classification System and Bright Northern Stars in the Blue-Violet at R~2500
• A fundamental plane for field star-forming galaxies
• Clues to the Origin of the Mass-Metallicity Relation: Dependence on Star Formation Rate and Galaxy Size
• The MOSDEF Survey: Electron Density and Ionization Parameter at $z\sim 2.3$
• New calibrations for abundance determinations in HII regions
• Oxygen and nitrogen abundances in nearby galaxies. Correlations between oxygen abundance and macroscopic properties
• The history of star-forming galaxies in the Sloan Digital Sky Survey
• The Mass-Metallicity relation explored with CALIFA: I. Is there a dependence on the star formation rate?
• CALIFA, the Calar Alto Legacy Integral Field Area survey: IV. Third Public data release
• CALIFA: a diameter-selected sample for an integral field spectroscopy galaxy survey
• The R136 star cluster dissected with Hubble Space Telescope/STIS. I. Far-ultraviolet spectroscopic census and the origin of HeII 1640 in young star clusters
• Semi-empirical analysis of Sloan Digital Sky Survey galaxies: II. The bimodality of the galaxy population revisited
• The Physical Properties and Effective Temperature Scale of O-type Stars as a Function of Metallicity. II. Analysis of 20 More Magellanic Cloud Stars, and Results from the Complete Sample
• Star formation is boosted (and quenched) from the inside out: radial star formation profiles from MaNGA
• The Massive Star Population of Cygnus OB2
• The Mass-Metallicity Relation revisited with CALIFA
• Precision abundance analysis of bright HII galaxies
• Widespread star formation inside galactic outflows
• The VLT-FLAMES Tarantula Survey XIV. The O-Type Stellar Content of 30 Doradus
• The properties of the extended warm ionised gas around low-redshift QSOs and the lack of extended high-velocity outflows
• The IACOB project. V. Spectroscopic parameters of the O-type stars in the modern grid of standards for spectral classification
• The temperature and ionization structure of the emitting gas in HII galaxies: Implications for the accuracy of abundance determinations
• The Physical Properties and Effective Temperature Scale of O-type Stars as a Function of Metallicity. III. More Results from the Magellanic Clouds
• Puzzling wind properties of young massive stars in SMC-N81
• The VLT-FLAMES Tarantula Survey XXIV. Stellar properties of the O-type giants and supergiants in 30 Doradus
• Spectroscopic and physical parameters of Galactic O-type stars. III. Mass discrepancy and rotational mixing
• Hot gas around SN 1998bw: Inferring the progenitor from its environment
• An Empirical Test and Calibration of H II Region Diagnostics
• The VLT-FLAMES Tarantula Survey XVIII. Classifications and radial velocities of the B-type stars
• The metal abundance of circumnuclear star forming regions in early type spirals. Spectrophotometric observations
• Analyzing derived metallicities and ionization parameters from model-based determinations in ionized gaseous nebulae
• Oxygen abundance maps of CALIFA galaxies
• The Runaways and Isolated O-Type Star Spectroscopic Survey of the SMC (RIOTS4)
• Photoionization models of the CALIFA HII regions. I. Hybrid models
• The VIRUS-P Exploration of Nearby Galaxies (VENGA): Spatially Resolved Gas-Phase Metallicity Distributions in Barred and Unbarred Spirals
• Mid-IR observations of Galactic HII regions: constraining ionizing spectra of massive stars and the nature of the observed excitation sequences
• The properties of ten O-type stars in the low-metallicity galaxies IC 1613, WLM and NGC 3109
• Spectroscopic evolution of massive stars on the main sequence
• On the 3D structure of the mass, metallicity, and SFR space for SF galaxies
• Metallicity and the spectral energy distribution and spectral types of dwarf O-stars
• Interaction effects on galaxy pairs with Gemini/GMOS- II: Oxygen abundance gradients
• The deep OB star population in Carina from the VST Photometric H$\alpha$ Survey (VPHAS+)
• The IACOB project: II. On the scatter of O-dwarf spectral type -- effective temperature calibrations
• Disentangling the metallicity and star formation history of HII galaxies through tailor-made models
• Using photo-ionisation models to derive carbon and oxygen gas-phase abundances in the rest UV
• O stars effective temperature and HII regions ionization parameter gradients in the Galaxy
• High resolution spectroscopy of the BCD galaxy Haro 15: II. Chemodynamics
• Detecting metal-poor gas accretion in the star-forming dwarf galaxies UM 461 and Mrk 600
• Abundance determination of multiple star-forming regions in the HII galaxy SDSS J165712.75+321141.4
• On the hardening of the ionizing radiation in HII regions across galactic discs through softness parameters
• Effective temperature of ionizing stars of extragalactic HII regions

Cited by in corpus (14)

• Chemical abundances of Seyfert 2 AGNs-III. Reducing the oxygen abundance discrepancy
• Chemical abundances of Seyfert 2 AGNs $-$II. N2 metallicity calibration based on SDSS
• Correlation between the gas-phase metallicity and ionization parameter in extragalactic HII regions
• Chemical abundances in Seyfert galaxies -IX. Helium abundance estimates
• Gas phase metallicity determinations in nearby AGNs with SDSS-IV MaNGA: evidence of metal poor accretion
• Metal-THINGS: On the metallicity and ionization of ULX sources in NGC 925
• Machine Learning Approach to Integral Field Unit Spectroscopy Observations: I. HII Region Kinematics
• Hardness of ionizing radiation fields in MaNGA star-forming galaxies
• Chemical abundance of LINER galaxies -- Metallicity calibrations based on SDSS-IV MaNGA
• Chemical Abundance of the LINER galaxy UGC 4805 with SDSS-IV MaNGA
• Properties of galaxies with an offset between the position angles of the major kinematic and photometric axes
• Chemical abundances in Seyfert galaxies -- VIII. Argon abundance estimates
• The dependence of the gradients of oxygen and nitrogen-to-oxygen on stellar age in MaNGA galaxies
• Chemical abundances in Seyfert galaxies -- VII. Direct abundance determination of neon based on optical and infrared emission lines